509458369 has 4 divisors (see below), whose sum is σ = 582238144. Its totient is φ = 436678596.

The previous prime is 509458337. The next prime is 509458403. The reversal of 509458369 is 963854905.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 509458369 - 2⁵ = 509458337 is a prime.

It is a super-2 number, since 2×509458369² = 519095659488280322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509453369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36389877 + ... + 36389890.

It is an arithmetic number, because the mean of its divisors is an integer number (145559536).

Almost surely, 2^509458369 is an apocalyptic number.

It is an amenable number.

509458369 is a deficient number, since it is larger than the sum of its proper divisors (72779775).

509458369 is an equidigital number, since it uses as much as digits as its factorization.

509458369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72779774.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 509458369 is about 22571.1844837616. The cubic root of 509458369 is about 798.6740373472.

The spelling of 509458369 in words is "five hundred nine million, four hundred fifty-eight thousand, three hundred sixty-nine".